9-13 July 2012
Africa/Johannesburg timezone
<a href="http://events.saip.org.za/internalPage.py?pageId=11&confId=14"><font color=#ff0000>SAIP2012 PROCEEDINGS AVAILABLE</font></a>

Structural, morphological and luminescence properties of hexagonal ZnO particles by wet chemical process

10 Jul 2012, 17:30
IT Building

IT Building

Poster Presentation Track A - Division for Condensed Matter Physics and Materials Poster Session


Prof. Francis Dejene (University of the Free State)

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Abstract content <br> &nbsp; (Max 300 words)

ZnO particles of different sizes were synthesized using a simple wet chemical method. This is a very attractive method, inexpensive and convenient for large area deposition. It is a low temperature process and the properties are easy to change by varying the deposition parameters. So-prepared ZnO particles were then characterized using scanning electron microscope, X-ray diffraction, PL spectroscopy and UV-Vis optical absorption spectra. The XRD pattern of a typical ZnO structures grown using wet-chemical process exhibit sharp diffraction peaks characteristic of the ZnO wurtzite hexagonal phase (wurtzite-type, space group P63mc, JCPDS card file No. 36-1451). SEM image confirm the hexagonal ZnO structure. The UV-vis absorption spectra of ZnO structures show that samples prepared at high pH value demonstrated similar properties as bulk materials. It was also found that energy band gap (Eg) does not increase significantly with the increase in molar concentration of reactant solution. The PL measurement depicts that the relative intensity difference between UV emission and green emission in ZnO generally depends on the process condition, particle size, source materials, and synthesis method. The characteristic emissions were found to be extremely broad and this broadening may be due to photon assisted by phonon transition.

Main supervisor (name and email)<br>and his / her institution


Primary author

Prof. Francis Dejene (University of the Free State)


Prof. Hendrik Swart (University of the Free Stae) Dr Jasper Dolo (University of the Free Stae) Mr Lehlohonolo Koao (University of the Free Stae)

Presentation Materials